Case IH F-7820-31 - CGR – CGR: Internal GNSS Antenna

The control module has detected a hardware failure, communication loss, or circuit fault specifically with the internal antenna element located inside the GNSS receiver dome, resulting in a loss of guidance and positioning data.

• MAGNUM AFS Connect
• STEIGER AFS Connect
• Case IH AFS Connect Magnum Series 180, 200, 220, 240, 250, 280, 310, 340, and 380

1. 1

   Power Cycle & Harness Check: Verify the CGR is receiving proper voltage. Unplug the receiver from the roof harness, wait 20 seconds, and plug it back in. Inspect the serial interface cable and pins for corrosion, moisture intrusion, or damage.

2. 2

   Check for Accompanying Codes: Look for other CGR hardware codes that might indicate a total receiver failure, such as 841-12 (Receiver Hardware Failure) or 516354-16 (Internal Voltage Failure).

3. 3

   Software Verification: Connect the CNH Electronic Service Tool (EST). Check the current software version of the CGR. Update to the latest version (e.g., v1.1.0.0, v2.1.0.0 or higher) to rule out false hardware flags before replacing the unit.

1. 1

   Power down

   Power down the machine and turn off the battery isolator switch.

2. 2

   Locate receiver

   Access the cab roof and locate the AFS Vector Pro (CGR) receiver.

3. 3

   Disconnect cable

   Disconnect the CGR serial interface cable from the back of the receiver.

4. 4

   Remove receiver

   Unlatch or unbolt the receiver from the roof mounting bracket and remove the faulty unit.

5. 5

   Install replacement

   Install the replacement CGR receiver onto the bracket and securely reconnect the interface cable.

6. 6

   Connect EST

   Power up the machine and connect the CNH EST laptop.

7. 7

   Flash firmware

   Select the CGR GNSS controller in the EST and put it into programming mode. Click "Download" to flash the correct and latest firmware to the new receiver.

8. 8

   Perform calibrations

   Perform mandatory guidance calibrations via the display/EST, including the Roll Calibration, Wheel Angle Sensor Calibration, and Steering Valve Calibration.